Structure-improved multifunction chassis

ABSTRACT

A structure-improved multifunction chassis, including a chassis base, a handle and a plurality of pull lines, wherein the chassis base includes a backrest angle adjustment device, a cushion lift adjustment device, and a back and forth moving cushion device, the chassis base is pivoted with a left and right connecting rod of a seat backrest frame; the handle includes a shift arm, a handle fixed block, and a handle base; the handle fixed block is installed in the handle base and is able to swing up and down, the handle fixed block is mounted on the handle base by bolts; one handle controls three pull lines at the same time, and the user adjusts the angle of the backrest, cushion lifting or moving back and forth by operating the handle.

FIELD OF THE INVENTION

The present invention relates to a seat, and more specifically to a structure-improved multifunction chassis, including one handle with three pull lines to adjust the angle of the backrest, the lift height of the cushion and the back and forth movement of the cushion.

BACKGROUND OF THE INVENTION

The seat is important equipment in the people's daily life and work life; in order to make the seat more comfortable and convenient, many different kinds of adjustable seats are designed by people, such as folding seat, lift swivel seat, adjustable backrest tilt angle seat.

The existing multifunction seat generally is composed of the chassis, a handle, a backrest, a headrest and a cushion, pursuing humanized work design, the chassis and the handle need to have multifunction operating structure: the backrest and the headrest are able to swing back and forth; the cushion is able to slide back and forth, so as to accord with the expectations of the comfort and the ergonomic. In the existing design of seat, a plurality of handles are installed on the both sides of the seat, but one handle has only one function, such as one handle controls the lift height of the cushion, the other handle controls the backrest and the headrest to swing back and forth, another handle controls the cushion to slide back and forth, obviously, there are so many handles that people feel more cumbersome when they use them. In addition, due to the limited space of the chassis, the structure of the multifunction chassis always has a very large size and heavy weight, those control rods with various adjustment function are convex, not only much energy is wasted to move the seat, but also the appearance of the seat is ugly and the seat is difficult to operate. Therefore, a new structure of a seat is provided, the chassis is pivoted with the seat backrest frame, and then the seat backrest frame is pivoted by a sliding rod, so the backrest frame is able to swing relative to the chassis, the sliding rod is controlled by springs, which controlled by the adjusting wheel. The slide block is mounted on the seat frame, and the movement of the cushion and the tilt angle of the backrest are controlled by the screw. For this structure of the chassis, there still are some disadvantages, such as the structure is complex, it's not easy to operate and the size is too large.

It is necessary to design a new style of adjustable seat to compensate for these defects.

SUMMARY OF THE INVENTION

In order to overcome the disadvantages of the prior art, the present invention provides a multifunction chassis that have a simple structure and is easy to operate. Only one handle of the seat is used to control backrest angle adjustment, the cushion lift adjustment and the back and forth movement of the cushion.

A structure-improved multifunction chassis, including a chassis base, a handle and a plurality of pull lines, wherein the chassis base includes a backrest angle adjustment device, a cushion lift adjustment device and a back and forth moving cushion device, the chassis base is pivoted with a left and right connecting rod of a seat backrest frame; the handle includes a shift arm, a handle fixed block and a handle base; the handle fixed block is installed in the handle base and is able to swing up and down, the handle fixed block is mounted on the handle base by bolts; a plurality of gear grooves formed on one end of the handle base comprises a first gear groove, a second gear groove and a third gear groove; the shift arm is installed in the handle base and is able to swing from side to side; the pull lines include a first pull line located in the first gear groove, a second pull line located in the second gear groove and a third pull line located in the third gear groove, the shift arm and the backrest angle adjustment device are linked by the first pull line; the shift arm and the cushion lift adjustment device are linked by the second pull line; the shift arm and the back and forth moving cushion device are linked by the third pull line.

A structure-improved multifunction chassis is provided by this invention, the backrest angel adjustment device includes a back fixed strip and a backward pull line anchor block, the back fixed strip defines a first slot, the backward pull line anchor block defines a second slot, the first pull line passes through the first slot and the second slot.

A structure-improved multifunction chassis is provided by this invention, the cushion lift adjustment device includes a shift member, a rocking handle, a gas strut and a pull line fixed block of shift member, the shift member defines a third slot, the pull line fixed block of shift member defines a fourth slot, the second pull line passes through the third slot and the fourth slot for connecting the gas strut.

A structure-improved multifunction chassis is provided by this invention, a gas strut lift adjustment switch disposes on one side of the gas strut and connects the second pull line.

A structure-improved multifunction chassis is provided by this invention, the back and forth moving cushion device includes a slide pedestal and a slide position control device for the slide pedestal which comprises a fixed base of slide pedestal, a slide positioning block of slide pedestal and a positioning spring of slide pedestal, and wherein the slide pedestal includes a bracket and a base, the third pull line passes through a fifth groove formed in the slide positioning block of slide pedestal.

A structure-improved multifunction chassis is provided by this invention, further including a rotating shaft, a first spring and a spring rotating base, the spring rotating base defines a sliding groove and has an axis, the spring is sheathed on the rotating shaft in a ring manner and is positioned in the spring rotating base, the two ends of the rotating shaft are fixedly connected with a left and right connecting rod of the seat backrest frame; there are two racks in the chassis base, which can be meshed with each other wherein one end of one rack is positioned in the sliding groove, and the other end thereof presses against a second spring; the other rack is able to slide in the chassis base so as to be meshed or separated with the rack, and is connected with the shift arm by the first pulling line; one exposed head of the second spring presses a cavity wall of the spring rotating base, and the other exposed head thereof presses a slide block which moves up and down; the slide block is connected with a screw by thread; and a top part of the screw is provided with a turntable which is connected with one end of a rocking handle by bevels.

A structure-improved multifunction chassis is provided by this invention, there are two first springs sheathed on the rotating shaft in a ring manner symmetrically.

A structure-improved multifunction chassis is provided by this invention, both end of the chassis base are pivoted with the left and right connecting rod of the seat backrest frame respectively, the slide pedestal is located above the left and right connecting rod of the seat backrest frame.

Through the combination of the above components, owing to the shift arm connects the backrest angle adjustment device, the cushion lift adjustment device and the back and forth moving cushion device respectively. So when the user rotates the shift arm upward according to the instructions of directional signs, the second pull line lead the cushion lift adjustment device to move up and the cushion goes up, The second pull line will be locked when the user stops rotating the shift arm, with the cushion keeps a certain height. When the shift arm is pressed downward, the second pull line will lead the cushion lift adjustment device to move down and the cushion goes down. The second pull line will be locked if the user stops pressing the shift arm. When the user needs to adjust the tilt angle of the backrest of the seat, he can pull the shift arm backward to make the lateral rack move by the first pull line, then the racks will be driven apart to achieve a backward rotation of the backrest, meanwhile, the rotating shaft will also rotate, leading to a rotation of the spring rotating base, one side wall of the sliding groove will press against the top part of the rack, making it move longitudinally. When the backrest rotates to the desired angle, release the shift arm, the spring of the fixed block pushes against the rack horizontally; two racks will be mesh with each other, making the longitudinal rack fixed to a specific position. If the user moves the shift arm forward, the third pull line will cause the cushion to slide. Therefore, the handle of this present invention is able to control three pull lines at the same time, and the operation is very simple and clear. All of the pull lines are controlled by the same handle, conforming to the user's operating habits, so it is very easy to use. Everyone can adjust the seat while sitting on it. And all of the installation, separation and maintenance of the chassis become easy.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the multifunction chassis in accordance with the present invention;

FIG. 2 is a schematic diagram of an exploded view of the multifunction chassis 125 of FIG. 1 in accordance with the present invention;

FIG. 3 is a structural diagram of the handle of FIG. 1 in accordance with the present invention;

FIG. 4 is a structural diagram of the back and forth moving cushion device of FIG. 1 in accordance with the present invention;

FIG. 5 is a structural diagram of the cushion lift adjustment device of FIG. 1 in accordance with the present invention;

FIG. 6 is a structural diagram of the backrest angle adjustment device of FIG. 1 in accordance with the present invention;

FIG. 7 is a structural diagram of parts of the chassis base of FIG. 1 in accordance with the present invention;

FIG. 8 is a schematic diagram of parts of the chassis of FIG. 1 in accordance with the present invention;

FIG. 9 is a structural diagram of the back and forth moving cushion device of FIG. 1 in accordance with the present invention;

FIG. 10 is a schematic diagram of the positioning of the handle of FIG. 1 in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The following illustrations are further explanations of the invention, with the instructions of the figures.

Referring to FIGS. 1-9, a structure-improved multifunctional chassis 1 includes a chassis base 2, a handle 3 and a plurality of pull lines 4. The chassis base 2 includes a backrest angle-adjustment device 5, a cushion lift adjustment device 6 and a back and forth moving cushion device 7. The chassis base 2 is fixedly connected with a left and right connecting rod of the seat backrest frame 8. The handle 3 comprises a shift arm 31, a handle fixed block 32 and a handle base 33. The handle fixed block 32 is installed on the handle base 33, which is able to swing up and down. The handle fixed block 32 and the handle base 33 are connected by bolts 34. The user can adjust the seat purposefully according to the directional signs (not shown) on the shift arm 31. A plurality of gear grooves (not shown) are formed on one end of the handle base 33, including a first gear groove (not shown), a second gear groove (not shown) and a third gear groove (not shown), the shift arm 31 installed in the handle base 33, which is able to swing from side to side. The pull lines 4 include a first pull line 41, a second pull line 42 and a third pull line 43. The shift arm 31 and the backrest angle adjustment device 5 are linked by the first pull line 41, which is located in the first gear groove (not shown); the shift arm 31 and the cushion lift adjustment device 6 are linked by the second pull line 42, which is located in the second gear groove (not shown); the shift arm 31 and the back and forth moving cushion device 7 are linked by the third pull line 43, which is located in the third gear groove (not shown).

As shown in FIG. 10, at the edge of the joint of the shift arm 31 and the handle fixed block 32, there are some arc-shaped openings 13, and both sides of the handle fixed block 32 have convex blocks 321, and in the middle of which there is a stretched block 322. When the handle fixed block 32 is connected to the handle holder 31, the stretched block 322 will insert into the shift arm 31, and the convex blocks 321 will against two sides of the shift arm 31 respectively. When the user turns the shift arm to left or right and the convex blocks 321 will be against the opening 13, then the shift arm 31 is positioned at the fixed place; similarly, when the user turns the shift arm 31 up or down, the stretched block 322 will be pulled out from the shift arm 31 to against the edge of the groove, then the holder 31 is positioned.

As shown in FIG. 6, the structure-improved multifunction chassis 1 is provided by this invention; the backrest angle adjustment device 5 includes a back fixed strip 51 and a backward pull line fixed block 52. The back fixed strip 51 defines a first slot 511, the backward pull line fixed block 52 defines a second slot 521, the first pull line 41 passes through the first slot 511 and the second slot 521.

As shown in FIG. 5 and FIG. 7, the structure-improved multifunction chassis 1 is provided by this invention, wherein the cushion lift adjustment device 6 includes a shift member 61, a rocking handle 62, a gas strut (not shown) and the shift member pull line fixed block 63, and the shift member 61 defines the third slot 611, and the shift member pull line fixed block 63 defines the fourth slot 631, and the second pull line 42 passes through the third slot 611 and the fourth slot 631 for connecting the gas strut (not shown). The gas strut lift adjustment switch (not shown) disposes on one side of the gas strut and connects the second pull line 42.

In FIG. 4 and FIG. 9, the structure-improved multifunction chassis 1 is provided by this invention, wherein the back and forth moving cushion device 7 includes a slide pedestal 71 and a slide position control device 72 for the slide pedestal 71 which comprises a fixed base 721 of slide pedestal 71, a slide positioning block 722 of slide pedestal 71 and a positioning spring 723 of slide pedestal 71, and wherein the slide pedestal 71 includes a bracket (not shown) and a base (not shown), the third pull line 43 passes through a fifth groove formed in the slide positioning block 722 of slide pedestal 71. The chassis base 2 further includes the slide frame (not shown). The slide pedestal 71 is able to move back and forth by the slide frame (not shown) relative to the bracket.

Preferred, the structure-improved multifunction chassis 1 is provided by this invention, further including a rotating shaft 21, a first spring 22 and a spring rotating base 23, the spring rotating base 23 defines a sliding groove (not shown) and has an axis (not shown), the spring 22 is sheathed on the rotating shaft 21 in a ring manner and is positioned in the spring rotating base 23, and the two ends of the rotating shaft 21 are fixedly connected with a left and right connecting rod of the seat backrest frame 8; there are two racks 24 in the chassis base 2, which can be meshed with each other wherein one end of one rack 25 is positioned in the sliding groove (not shown), and the other end thereof presses against a second spring 26; the other rack25 is able to slide in the chassis base 2 so as to be meshed or separated with the rack 24, and is connected with the shift arm 31 by the first pulling line 41; one exposed head of the second spring 26 presses the cavity wall of the spring rotating base 23, and the other exposed head thereof presses a slide block 9 which moves up and down; the slide block 9 is connected with a screw 10 by thread; and a top part of the screw 10 is provided with a turntable 11 which is connected with one end of a rocking handle 62 by bevels.

The structure-improved multifunction chassis 1 is provided by this invention, there are two first springs 22 sheathed on the rotating shaft 21 in a ring manner symmetrically.

Preferred, the structure-improved multifunction chassis 1 is provided by this invention, both end of the chassis base 2 are pivoted with the left and right connecting rod of the seat backrest frame 8 respectively, the slide pedestal 71 is located above the left and right connecting rod of the seat backrest frame 8.

Owing to the shift arm 31 connects the backrest angle adjustment device 5, the cushion lift adjustment device 6 and the back and forth moving cushion device 7 respectively. So when the user rotates the shift arm 31 upward according to the instructions of directional signs, the second pull line 42 lead the cushion lift adjustment device 6 to move up and the cushion goes up, The second pull line 42 will be locked when the user stops rotating the shift arm 31, with the cushion keeps a certain height. When the shift arm 31 is pressed downward, the second pull line will 42 lead the cushion lift adjustment device 6 to move down and the cushion goes down. The second pull line 42 will be locked if the user stops pressing the shift arm 31. When the user needs to adjust the tilt angle of the backrest of the seat, he can pull the shift arm 31 backward to make the lateral rack move by the first pull line 41, then the racks will be driven apart to achieve a backward rotation of the backrest, meanwhile, the rotating shaft 21 will also rotate, leading to a rotation of the spring rotating base 23, one side wall of the sliding groove will press against the top part of the rack, making it move longitudinally. When the backrest rotates to the desired angle, release the shift arm 21, the spring of the fixed block pushes against the rack horizontally; two racks will be mesh with each other, making the longitudinal rack fixed to a specific position. If the user moves the shift arm 31 forward, the third pull line 43 will cause the cushion to slide. Therefore, the handle of this present invention is able to control three pull lines at the same time, and the operation is very simple and clear. All of the pull lines are controlled by the same handle, conforming to the user's operating habits, so it is very easy to use. Everyone can adjust the seat while sitting on it. And all of the installation, separation and maintenance of the chassis become easy.

When the user needs to adjust the tilt angle of the backrest of the seat, the user can pull the shift arm 31, and the shift arm 31 pulls the rack which connects with the shift arm 31 by the pull lines, and two meshed racks will be separated from each other, therefore the backrest is able to move back and forth under the condition of the spring-rotating base 23 pulls the rack which connects with the spring-rotating base 23. When the backrest move to the desired position, releasing the shift arm, the rack which is connected with the shift arm 31 meshes another rack which is connected with the spring-rotating base 23 under the pressure of the spring, making the backrest rotate to a certain angle. The control system of the tilt angle of the backrest has the advantages of simple structure, convenient operation, small size and light weight. The springs in the spring-rotating base are able to make the backrest of the seat back to its original state when the people leave the seat, not only the space is saved, but also the seat conformities with ergonomics. The elastic force of the springs can be adjusted by the handle to make the seat meet the needs of different people. The shift arm connected with the rack is installed in the handle base, and the shift arm is able to swing up and down. The user adjusts the angle of the backrest, cushion lifting or moving back and forth by operating the handle, not only achieving convenient operation, also according with the habits of the people's daily operation.

In addition, when the user needs to adjust the cushion height, the user rotates the shift arm 31 upward according to the instructive mark, the second pull line 42 drives the shift member 61, the pull line fixed block 63 of shift member 61 and the gas strut to down, thereby the gas strut lift adjustment switch is pressed and leads the cushion lift adjustment device 6 to move upward and the cushion rises. The second pull line 42 will be locked while the user stops rotating the shift arm 31, with the cushion is fixed at that height. When the user presses the shift arm 31, the second pull line 42 drives the shift member 61, the pull line fixed block 63 of shift member 61 and the gas strut to down, thereby the gas strut lift adjustment switch is pressed and leads the cushion lift adjustment device 6 to move downward, making the cushion back to the original height, or even making the cushion sets. The second pull line will be locked while the user stops pressing the shift arm 31.

When the user needs that the cushion moves backward and forward, the slide pedestal 71 moves back and forth by the slide frame relative to the bracket. When the user moves the cushion forward, the third pull line 43 drives the slide positioning block 722 of slide pedestal 71 slide to divorce the fixed base 721 of slide pedestal 71, thereby the slide position control device leads the cushion to move back and forth, when it moves to the desired position, releasing the shift arm 31, the slide positioning block 722 rivets the fixed base 721 under the elastic force of the slide positioning spring, thereby limiting the cushion to continue to move forward and backward.

There are some following advantages while this invention of multifunction chassis compared with the exiting chassis:

One handle controls three pull lines at the same time, and the user adjusts the angle of the backrest, cushion lifting or moving back and forth by operating the handle, not only convenient operation is achieved, but also it accords with the habits of the people's daily operation. Everyone can adjust the seat while sitting on it.

It should be noted that, the present invention is mainly in accordance of a structure-improved multifunction chassis, suitable for different size and shape of chassis. Any structure and mounting method relates to this invention is in the scope of the invention protection issues. While the present invention has been illustrated by the above description of the preferred embodiments thereof, while the preferred embodiments have been described in considerable detail, it is not intended to restrict or in any way limit the scope of the appended claims to such details. Other advantages and modifications within the spirit and scope of the present invention will readily appear to those skilled in the art. Therefore, the present invention is not limited to the specific details and the illustrative examples shown and described. 

What is claimed is:
 1. A structure-improved multifunction chassis, comprising a chassis base, a handle, and a plurality of pull lines, wherein: the chassis base comprises a backrest angle adjustment device, a cushion lift adjustment device, and a back and forth moving cushion device, the chassis base is pivoted with a left and right connecting rod of a seat backrest frame; the handle comprises a shift arm, a handle fixed block, and a handle base; the handle fixed block is installed in the handle base and is able to swing up and down, the handle fixed block is mounted on the handle base by bolts; a plurality of gear grooves formed on one end of the handle base comprises a first gear groove, a second gear groove, and a third gear groove; the shift arm is installed in the handle base and is able to swing from side to side; the pull lines comprise a first pull line located in the first gear groove, a second pull line located in the second gear groove, and a third pull line located in the third gear groove, the shift arm and the backrest angle adjustment device are linked by the first pull line; the shift arm and the cushion lift adjustment device are linked by the second pull line; the shift arm and the back and forth moving cushion device are linked by the third pull line.
 2. The structure-improved multifunction chassis of claim 1, wherein the backrest angel adjustment device comprises a back fixed strip and a backward pull line anchor block, the back fixed strip defines a first slot, the backward pull line anchor block defines a second slot, the first pull line passes through the first slot and the second slot.
 3. The structure-improved multifunction chassis of claim 1, wherein the cushion lift adjustment device comprises a shift member, a rocking handle, a gas strut and a pull line fixed block of shift member, the shift member defines a third slot, and the pull line fixed block of shift member defines a fourth slot, and the second pull line passes through the third slot and the fourth slot for connecting the gas strut.
 4. The structure-improved multifunction chassis of claim 3, wherein a gas strut lift adjustment switch disposes on one side of the gas strut and connects the second pull line.
 5. The structure-improved multifunction chassis of claim 1, wherein the back and forth moving cushion device comprises a slide pedestal and a slide position control device for the slide pedestal which comprises a fixed base of slide pedestal, a slide positioning block of slide pedestal and a positioning spring of slide pedestal, and wherein the slide pedestal comprises a bracket and a base, the third pull line passes through a fifth groove formed in the slide positioning block of slide pedestal.
 6. The structure-improved multifunction chassis of claim 1, wherein further comprising a rotating shaft, a first spring, and a spring rotating base, the spring rotating base defines a sliding groove and has an axis, the spring is sheathed on the rotating shaft in a ring manner and is positioned in the spring rotating base, and the two ends of the rotating shaft are fixedly connected with a left and right connecting rod of the seat backrest frame; there are two racks in the chassis base, which can be meshed with each other wherein one end of one rack is positioned in the sliding groove, and the other end thereof presses against a second spring; the other rack is able to slide in the chassis base so as to be meshed or separated with the rack, and is connected with the shift arm by the first pulling line; one exposed head of the second spring presses a cavity wall of the spring rotating base, and the other exposed head thereof presses a slide block which moves up and down; the slide block is connected with a screw by thread; and a top part of the screw is provided with a turntable which is connected with one end of a rocking handle by bevels.
 7. The structure-improved multifunction chassis of claim 6, wherein there are two first springs sheathed on the rotating shaft in a ring manner symmetrically.
 8. The structure-improved multifunction chassis of claim 1, wherein both end of the chassis base are pivoted with the left and right connecting rod of the seat backrest frame respectively, the slide pedestal is located above the left and right connecting rod of the seat backrest frame. 